M3 Repository Initialization Evidence

RED commit: 1115f63 — repository safety contract tests failed because inspection/list endpoints and safety behavior were absent.
GREEN commit: 448fa98 — repository canonical metadata inspection, capacity checks, safe staging cleanup, and authenticated list/inspection endpoints.
Verification: python -m pytest tests/integration/test_repository_safety.py tests/integration/test_repositories.py -q → 4 passed; make check → 39 unit/contract, 16 integration, 3 security tests, Ruff, mypy, and frontend typecheck/build passed.
Scope: no source, job, execution, scheduling, or encryption creation behavior was added.